I want to be able to load certain GHC modules in interpreted mode in ghci so I can set breakpoints in them. I have tests in the testsuite that are compiled by inplace/bin/ghc-stage2 with -package ghc. I can load the tests with ghc-stage2 --interactive -package ghc but since ghc is compiled I can only set breakpoints in the tests themselves. Loading the relevant files by passing them as absolute paths to :l loads them but ghci doesn't stop at the breakpoints placed in them (I'm guessing because ghci doesn't realize that the module I just loaded is meant to replace the compiled version in -package ghc). So if I use inplace/bin/ghc-stage2 --interactive -package ghc mytest.hs then :l abs/path/to/AsmCodeGen.hs and set breakpoints, nothing happens. Ideally I'd only have to load the module I'm debugging (and it's dependencies?) but if that isn't possible how would I get ghci to load all of GHC in interpreted mode (intead of using -package ghc)? Currently I'm using trace & friends to do printf-style debugging but it's definitely not ideal. -Thomas Jakway